| Author | Message | ||
     Johnboy777 |
I was the local Harley shop today, picking up parts for the Uly and was lucky enough to have the boss give me a tour of the facility. They have a nice bike dyno and I thought I might make use of it after I get my new exhaust installed, towards the end of Dec. I guess the question i have, is how useful are they, really; is it a good idea for establishing a 'where am I now' baseline, and can I use the print out/info sheet to go back and tune it with ECMspy. I am really unfamiliar with all of this and any help would be appreciated. Thanks John . (Message edited by johnboy777 on December 04, 2008) | ||
| Wheelybueller |
Yes,a baseline is good. Tuning without a dyno is possible,look back 20 years,that's how it was done. As with any tool,You need the knowledge to use it. If the dyno operator explains your graph to you they can expedite your "seat of the pants tune" Just remember,Peak power doesn't make you fast,Smooth lineal power does,at least in street. I prefer smooth power in my daily driver(XB12xt) The XB9r Will be high end tuned. | ||
| Johnboy777 |
Thanks Wheel, Besides HP and torque, what other parameters do they typically monitor? I'd like to know where I am lean or fat, as well. . | ||
| Paul56 |
Also keep in mind each dyno is different. Even the same model from the same mfgr would likely provide different results from unit to unit. They are way cool to experiment on though. | ||
| Jammin_joules |
The gear the dyno runs are done with, tire pressure, clutch adjustment, even not paying attention to air temperature can all effect numbers on a dyno. Besides peak hp & torque, and flatness of the power band, look for as flat as possible a air-to-fuel mixture (good dynos have exhaust gas sniffer capability) and the rate or steepness of the slope of the rise to your sweet power band. That's acceleration off low rpm. ~jammer | ||
| Wheelybueller |
Things that can be checked; AFR Ignition Time to HP Time to TQ Exhaust Intake Take into account the machine is only as good as the operator. | ||
| Johnboy777 |
""Take into account the machine is only as good as the operator."" Thanks, good point, and at $250 for the session, I need to understand what I'm looking for. . | ||
| Wheelybueller |
Ask the "tuner"to see results from similar bikes,Buells are different than H-D,and or others. you want someone who knows DDFI. | ||
| Johnboy777 |
Thanks for all the comments, I need to read up this some more, but I think I have a direction to go in now. I went back today, and it appears the parts guy @ Biketown HD misspoke - it's $50 for one run and $250 to tune. $50 sounds more like it - of course they aren't set up to tune the Uly. They said the brand is DynoTune and it does measure exhaust gases, so I can get a report on my AFR as well. I'll get a run before and after my MagnaFlow exhaust install and compare 'em. I'm not real interested in HP, good driveability and more torque is always a plus, though. I'll post before and after printouts ... spending 100 bucks for both sounds like a deal to me. . | ||
| Buelldyno_guy |
Again a word of caution before allowing any re-tuning of a fuel injected Buell. The last six years have taught me that there are several on this board that have a good understanding of how to trouble shoot these bikes and keep then running correctly. And there are also several here who have some good experience/time in the Dyno Room with the H-D/Buell family of bikes. However the combination of the two together is sort of rare. Each year with the changes that a new model brings, both Al from American Sport Bike and I have continued to gain insights into how the BMC has improved the product. Little things such as the differences between the early XB9 ECM controlling the small two piece throttle body, and how it differs from the later one controlling the larger one piece unit. So what I am saying is for you to interview a candidate to tune your Buell by asking them to show you how they will set up and tune the both the "closed loop" and "closed loop learn" section of the map. If they know what you are talking about and understand how the AFV works then can make their Dyno provide the correct data, you should be OK. Now about the cost, we will make the initial run on your bike for Free and then take the time to explain what we see. Out Business Plan is for the "Box" (Dyno Room) to earn about $100 per hour, but never get close to that when tuning a Buell. It takes somewhere between 10-20 hours to develop a map from scratch and we get between $100 -$300. Once it's done if you use the same "Intake/Exhaust Configuration" the map is something American Sport Bike can sell to you as a down load. If you are up here in the N Calif. Wine Country I can do the same, but if you desire will put it in the "Box" and tweak it if needed and you will get a run sheet. As there are several dyno shops in the Bay Area, it was in our best interest to use a flat rate that is right in line with our competition. That is why we try and give as a little extra value a Free base run allowing a quick look at your numbers. Hope this helps Terry. ... JT&S Performance |
